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Inventories (Major Components of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Petroleum products $ 4,235 $ 2,721
Crude oil 35,676 5,271
Caustic soda 4,973 5,965
NaHS 14,757 10,845
Raw materials - Alkali operations 7,320 6,238
Work-in-process - Alkali operations 12,784 8,579
Finished goods, net - Alkali operations 16,614 14,168
Materials and supplies, net - Alkali operations 13,172 11,350
Total $ 109,531 $ 65,137